Question:-
A full journal bearing having clearance to radius ratio of 1/100, using a lubricant with m = 28 x 10-3 Pas supports the shaft journal running at N = 2400 r.p.m. If bearing pressure is 1.4 MPa, the Sommerfeld number is
Option (A)
8 x 10-3
Option (B)
8 x 10-5
Option(C)
0.48
Option(D)
0.48 x 10-2
Correct Option:
(A)
Question Solution:
S = (r/c)2. (mns/p)
=[ {(100)2 x 28 x 10-3 x 2400} / (1.4 x 106 x 60)] = 8 x 10-3
question-answer-faq-9305